package com.hskn.hss.utils;

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.codec.binary.Base64;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.crypto.*;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

@Slf4j
public class AES {
    /**
     * AES_KEY
     */
    public static final String AES_KEY = "6b35zvr6ytexloagbdo3emj2ztzs7yqy"; // 32位
    /**
     * LOGGER
     */
    private static Logger LOGGER = LoggerFactory.getLogger(AES.class); // 日志记录

    /**
     * 加密
     *
     * @param content  需要加密的内容
     * @param password 加密密码
     * @return byte
     */
    public static byte[] encrypt(String content, String password) {
        try {
            KeyGenerator kgen = KeyGenerator.getInstance("AES");
            SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
            random.setSeed(password.getBytes());
            kgen.init(128, random);
            SecretKey secretKey = kgen.generateKey();
            byte[] enCodeFormat = secretKey.getEncoded();
            SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
            Cipher cipher = Cipher.getInstance("AES");// 创建密码器
            byte[] byteContent = content.getBytes("UTF-8");
            cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
            byte[] result = cipher.doFinal(byteContent);
            return result; // 加密
        } catch (NoSuchAlgorithmException e) {
            LOGGER.error(" encrypt failure.", e);
        } catch (NoSuchPaddingException e) {
            LOGGER.error(" encrypt failure.", e);
        } catch (InvalidKeyException e) {
            LOGGER.error(" encrypt failure.", e);
        } catch (UnsupportedEncodingException e) {
            LOGGER.error(" encrypt failure.", e);
        } catch (IllegalBlockSizeException e) {
            LOGGER.error(" encrypt failure.", e);
        } catch (BadPaddingException e) {
            LOGGER.error(" encrypt failure.", e);
        }
        return null;
    }

    /**
     * 解密
     *
     * @param content  待解密内容
     * @param password 解密密钥
     * @return byte
     */
    public static byte[] decrypt(byte[] content, String password) {
        try {
            KeyGenerator kgen = KeyGenerator.getInstance("AES");

            SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
            random.setSeed(password.getBytes());
            kgen.init(128, random);
            SecretKey secretKey = kgen.generateKey();
            byte[] enCodeFormat = secretKey.getEncoded();
            SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
            Cipher cipher = Cipher.getInstance("AES"); // 创建密码器
            cipher.init(Cipher.DECRYPT_MODE, key); // 初始化
            byte[] result = cipher.doFinal(content);
            return result; // 加密
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
            LOGGER.error(" encrypt failure.", e);
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
            LOGGER.error(" encrypt failure.", e);
        } catch (InvalidKeyException e) {
            e.printStackTrace();
            LOGGER.error(" encrypt failure.", e);
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
            LOGGER.error(" encrypt failure.", e);
        } catch (BadPaddingException e) {
            e.printStackTrace();
            LOGGER.error(" encrypt failure.", e);
        }
        return null;
    }

    /**
     * 将二进制转换成16进制
     *
     * @param buf byte
     * @return String
     */
    public static String parseByte2HexStr(byte[] buf) {
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < buf.length; i++) {
            String hex = Integer.toHexString(buf[i] & 0xFF);
            if (hex.length() == 1) {
                hex = '0' + hex;
            }
            sb.append(hex.toUpperCase());
        }
        return sb.toString();
    }

    /**
     * 将16进制转换为二进制
     *
     * @param hexStr String
     * @return byte
     */
    public static byte[] parseHexStr2Byte(String hexStr) {
        if (hexStr.length() < 1) {
            return null;
        }

        byte[] result = new byte[hexStr.length() / 2];
        for (int i = 0; i < hexStr.length() / 2; i++) {
            int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
            int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);
            result[i] = (byte) (high * 16 + low);
        }
        return result;
    }

    /**
     * 加密
     *
     * @param content  需要加密的内容
     * @param password 加密密码
     * @return byte[]
     */
    public static byte[] encrypt2(String content, String password) {
        try {
            SecretKeySpec key = new SecretKeySpec(password.getBytes(), "AES");
            Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding");
            byte[] byteContent = content.getBytes("utf-8");
            cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
            byte[] result = cipher.doFinal(byteContent);
            return result; // 加密
        } catch (NoSuchAlgorithmException e) {
            LOGGER.error(" encrypt failure.", e);
        } catch (NoSuchPaddingException e) {
            LOGGER.error(" encrypt failure.", e);
        } catch (InvalidKeyException e) {
            LOGGER.error(" encrypt failure.", e);
        } catch (UnsupportedEncodingException e) {
            LOGGER.error(" encrypt failure.", e);
        } catch (IllegalBlockSizeException e) {
            LOGGER.error(" encrypt failure.", e);
        } catch (BadPaddingException e) {
            LOGGER.error(" encrypt failure.", e);
        }
        return null;
    }

    /**
     * @param args String
     */
    public static void main(String[] args) {
        String content = "{\"nick\":\"dev_test\",\"date\":1516865528008,\"password\":\"A1F145CC2F2635E2\",\"systemIds\":[0,3,5,8],\"mid\":22506}";
        // 加密
        log.info("加密前：" + content);
        byte[] encryptResult = encrypt(content, AES_KEY);
        String tt4 = Base64.encodeBase64String(encryptResult);
        log.info("加密后：" + tt4);
        // 解密
        byte[] decrptResultBytes = Base64.decodeBase64(tt4);
        byte[] decryptResult = decrypt(decrptResultBytes, AES_KEY);
        log.info("解密后：" + new String(decryptResult));
    }
}
